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Finding the Fourth Proportional to 420,815.70, 631,223.55 and 346,020.30

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Solution

The fourth proportional to 420,815.70, 631,223.55 and 346,020.30 is: 519,030.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,815.70 : 631,223.55 = 346,020.30 : x
  2. Step 2: Convert to fraction form
    420,815.70/631,223.55 = 346,020.30/x
  3. Step 3: Cross multiply
    420,815.70x = 631,223.55 × 346,020.30
  4. Step 4: Simplify right side
    420,815.70x = 218,416,162,138.07
  5. Step 5: Solve for x
    x = 218,416,162,138.07/420,815.70
  6. Step 6: Final answer
    x = 519,030.45

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.